Benedetto Castelli, born Antonio Castelli (1578 - April 9 1643) was an Italian mathematician. He took the name "Benedetto" upon entering the Benedictine Order in 1595. Born in Brescia, he studied at the University of Padua and later became an abbot at the Benedictine monastery in Monte Cassino. He was a long-time friend and supporter of his teacher, Galileo Galilei. Wikipedia
The definitive Wikipedia entry for Benedetto Castelli. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Benedetto_Castelli
